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Efficacy of Interrow Weed Control Techniques in Wide Row Narrow-Leaf Lupin

  • Abul Hashem (a1), R. Michael Collins (a2) and David G. Bowran (a1)

Abstract

The sharp decline in the area of lupin grown in Australia is partly attributed to the failure to control herbicide-resistant weeds in narrow-leaf lupin crops grown with the conventional 25-cm-wide row spacing. Growing lupin with wider row spacing allows for interrow weed control by nonselective herbicides using a sprayshield or physical methods. During 2003 to 2006, two experiments conducted at five sites evaluated the efficacy of interrow weed control techniques in narrow-leaf lupin crops grown in 55- to 65-cm-wide rows within the Western Australia wheatbelt. Interrow herbicides were applied POST using sprayshields, intrarow herbicides were banded on lupin rows at seeding, and interrow weeds were mowed using a garden mower. The main weed species at each site was rigid ryegrass, blue lupin, or wild radish. Paraquat plus diquat applied on the interrow of the lupin crop with sprayshields controlled up to 100% of weeds between rows, leading to increases in lupin grain yield in most of the sites. Glyphosate alone, a mixture of glyphosate plus metribuzin, and glyphosate followed by paraquat plus diquat also controlled interrow weeds, but did not increase lupin grain yield at any site. Thus, paraquat plus diquat is a better choice for interrow weed control in wide row lupin than glyphosate. Mowing did not improve weed control, but mowing followed by paraquat plus diquat increased lupin grain yield at one site. Regression models predicted that there was a strong relationship between weed biomass and lupin grain yield.

Una marcada disminución en el área con lupino en Australia es parcialmente atribuida a la falta de control de malezas resistentes a herbicidas en el cultivo de lupino de hoja angosta (Lupinus angustifolius), con el espacio convencional entre surcos de 25 cm. El cultivo de lupino con un espacio mayor entre surcos permite un control de malezas entre los mismos con herbicidas no selectivos, utilizando una pantalla o métodos físicos. De 2003 a 2006, se realizaron dos experimentos en cinco sitios que evaluaron la eficacia de las técnicas de control de maleza entre surcos en el cultivo de lupino de hoja angosta, sembrado en surcos de 55 a 65 cm de ancho en la franja triguera del occidente de Australia. Se aplicó herbicida posemergente entre los surcos usando pantallas; en los surcos los herbicidas se aplicaron en bandas a los surcos de lupino al momento de la siembra, y las malezas entre los surcos se cortaron usando una podadora de jardín. Las especies principales de maleza en cada sitio fueron Lolium rigidum, Lupinus cosentinii o Raphanus raphanistrum. El paraquat más diquat aplicado con pantalla entre los surcos de lupino controló hasta el 100% de la maleza entre los surcos, resultando en incrementos en el rendimiento del grano en la mayoría de los sitios. El glifosato solo, una mezcla de glifosato más metribuzina y glifosato seguido de paraquat más diquat, también controlaron las malezas entre los surcos, pero no incrementaron el rendimiento del grano en ningún sitio. Por lo tanto, en el cultivo de lupino en surcos anchos, el paraquat más diquat es una mejor opción que el glifosato para el control de malezas entre los surcos. La chapia con podadora no mejoró el control de malezas, pero la chapia, seguida con la aplicación de paraquat más diquat, incrementó el rendimiento del grano en un sitio. Los modelos de regresión predijeron que hay una fuerte relación entre la biomasa de las malezas y el rendimiento del grano de lupino.

Copyright

Corresponding author

Corresponding author's E-mail: abul.hashem@agric.wa.gov.au

References

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